nk497 writes: "UK ISP Virgin Media and two of the largest mobile networks, Everything Everywhere and Vodafone, are among the high-profile absentees from a new voluntary code of conduct on net neutrality, set to be unveiled tomorrow. The code requires those who sign it to give users access to all legal content and not to discriminate against content providers on the basis of a commercial rivalry — but Virgin has refused to sign because it isn't tough enough. "These principles remain open to misinterpretation and potential exploitation so, while we welcome efforts to reach a broad consensus to address potential future issues, we will be seeking greater certainty before we consider signing," a company spokesman said."